Recent metallurgical testwork completed by Core Resources for Felix Gold Limited’s (ASX: FXG) Treasure Creek Antimony Project in Alaska has demonstrated exceptional ore quality and strong metallurgical performance, supporting multiple simplified ore-to-metal processing pathways.
View the full ASX announcement here or read the summary below.
Key Results
Testwork completed on a bulk sample of massive stibnite ore delivered several standout outcomes:
- Ore exceeds U.S. Military Concentrate Specification (MIL-A-22131) as direct shipping ore
- High-grade material confirmed, with 71.9% Sb and ~90.8% stibnite mineralogy
- Direct smelting of untreated ore successfully produced antimony metal
- Hydrometallurgical testwork achieved ~99% Sb extraction at a coarse grind size (150–300 µm)
- Strong performance maintained at coarser particle sizes, indicating potential for reduced processing requirements
These results demonstrate both pyrometallurgical and hydrometallurgical pathways for producing antimony metal directly from high-grade ore.
Core Resources’ Role
Core Resources conducted head characterisation, hydrometallurgical testwork and direct smelting trials on a 370 kg bulk sample of massive stibnite ore.
Characterisation work confirmed exceptional ore purity, with negligible deleterious elements and mineralogy dominated by stibnite. This established a strong foundation for downstream testwork.
Core also completed alkaline sulfide leach testwork, achieving high extraction efficiencies at relatively coarse grind sizes. In parallel, direct smelting trials demonstrated that untreated ore can be converted directly to antimony metal, confirming a simplified alternative processing route.
Next Steps
The testwork results support ongoing development of multiple processing pathways for the Treasure Creek Project, including both direct smelting and hydrometallurgical flowsheets.
Upcoming work and project activities include:
- Continued leach and electrowinning testwork programs
- Evaluation of processing pathways, including toll treatment and a dedicated U.S. facility
- Advancement toward potential near-term production scenarios
Want to learn more about how Core Resources supports critical minerals projects like Treasure Creek?
Visit our Metallurgical Testwork Services page or get in touch with our team to discuss how we can support your project.
